COTO RI

RI-21 Series Dry Reed Switch
RI-21 Series
Micro dry-reed switch hermetically sealed in a gas-filled envelope.
Single-pole, single-throw (SPST) type, having normally open contacts,
and containing two magnetically actuated reeds.
The switch is of the double-ended type and may be actuated by an
electromagnet, a permanent magnet or a combination of both.
The device is intended for use in sensors, relays, pulse counters or
similar devices.
RI-21 Series Features
General purpose reed switch
High breakdown voltage
Contact layers: gold, plated ruthenium
Superior glass-to-metal seal and blade alignment
Excellent life expectancy and reliability
Dimensions in inches (mm)
General data for all models RI-21
AT-Customization / Preformed Leads
Besides the standard models, customized products can
also be supplied offering the following options:
! Operate and release ranges to customer
specification
! Cropped and/or preformed leads
Coils
All characteristics are measured using the Philips
Standard Coil. For definitions of the Philips Standard
Coil, refer to “Application Notes” in the Reed Switch
Technical & Application Information Section of this
catalog.
Life expectancy and reliability
The life expectancy data given below are valid for a
coil energized at 1.25 times the published maximum
operate value for each type in the RI-21 series.
No load conditions (operating frequency: 100Hz)
End of life criteria:
Contact resistance > 1Ω after 2 ms
Release time > 2 ms (latching or contact sticking).
Loaded conditions (resistive load: 12 V; 4 mA;
(15 mA peak); operating frequency: 170 Hz)
Life expectancy: min. 107 operations with a failure rate
of less than 10-8 with a confidence level of 90%.
End of life criteria:
Contact resistance > 2Ω after 4 ms
Release time > 0.7 ms (latching or contact
sticking). Switching different loads involves
different life expectancy and reliability data. Further
information is available on request.
Mechanical Data
Contact arrangement is normally open; lead finish is
tinned; net mass is approximately 190 mg; and can be
mounted in any position.
Life expectancy : min. 108 operations with a failure
rate of less than 10-9 with a confidence level of 90%.
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COTO TECHNOLOGY (USA) Tel: (401) 943-2686 / Fax (401) 942-0920
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(Europe) Tel: +31-45-5439343 / Fax +31-45-5427216
RI-21 Series Dry Reed Switch
Shock
The switches are tested in accordance with “IEC 68-227”, test Ea (peak acceleration 150 G, half sinewave;
duration 11 ms). Such a shock will not cause an open
switch (no magnetic field present) to close, nor a switch
kept closed by an 80 AT coil to open.
Vibration
The switches are tested in accordance with “IEC 68-26”, test Fc (acceleration 10G; below cross-over frequency 57 to 62 Hz; amplitude 0.75 mm;
frequency range 10 to 2000 Hz, duration 90 minutes).
Such a vibration will not cause an open switch (no
magnetic field present) to close, nor a switch kept
closed by an 80 AT coil to open.
+125°C. Note: Temperature excursions up to 150°C
may be permissible. For more information contact your
nearest Coto Technology sales office.
Soldering
The switch can withstand soldering heat in accordance
with “IEC 68-2-20”, test Tb, method 1B: solder bath at
350 ±10°C for 3.5 ±0.5 s. Solderability is tested in
accordance with “IEC 68-2-20”, test Ta, method 3:
solder globule temperature 235°C; ageing 1b: 4 hours
steam.
Welding
The leads can be welded.
Mechanical Strength
Mounting
The robustness of the terminations is tested in accordance with “IEC 68-2-21”, test Ua1 (load 40 N).
The leads should not be bent closer than 1 mm to the
glass-to-metal seals. Stress on the seals should be
avoided. Care must be taken to prevent stray magnetic
fields from influencing the operating and measuring
conditions.
Operating and Storage Temperature
Operating ambient temperature; min: -55°C;
max: +125°C. Storage temperature; min: -55°C; max:
For Most Recent Data, Consult the Coto Technology Website: www.cotorelay.com
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E-mail: [email protected]
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